[$] Facing down mapcount madness

Date:
Tue, 21 May 2024 12:54:06 +0000

Description:
The page structure is a complicated beast, but some parts of it are more intimidating than others. The mapcount field is one of the
scarier parts. It allegedly records the number of references to the page
in page tables, but, as David Hildenbrand described during the memory-management track at the 2024 Linux Storage,
Filesystem, Memory Management, and BPF Summit , things are more
complicated than that. Few people truly understand the semantics of this field, but the situation will hopefully get better over time.

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Link to news story:
https://lwn.net/Articles/974223/


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